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The emergence of the legendary weapon Seraph Wings allowed the empire to capture half of the continent, and also opened a new chapter in human cognition - the brain is just a tool for processing information, and what truly dominates people's behavioral norms are two special existences, the heart core and the heart ring body. The peaceful daily life of the fallen prince Ye Xingyu changed dramatically after he woke up one morning. How will he deal with these sudden changes? After experiencing all this, which path will he take at the crossroads of life? Does the Book of Iris, the urban legend that can change everything, really exist?

The abandoned city of Ered has lived peacefully under the protection of the barrier for more than 200 years. The two countries behind the high wall have also relied on the moon crystal to resist invading monsters time and time again. However, all peace was once again disturbed by a murder case in Aled. Where did the monsters outside the wall come from? What are the mysterious Moonlight Holy Cult and Moon God Crystal? What is the story behind the saint Kahn who sacrificed himself to save Eled? What unknown truth is hidden in the two hundred years of war between the two countries behind the wall? Everything will be gradually revealed following Aled, a man who seems ordinary but is anything but ordinary.